nightfall vs eve

nightfall and eve both are nouns.

Word	Noun	Adjective	Verb	Adverb
nightfall	Yes	No	No	No
eve	Yes	No	No	No

nightfall (noun)	eve (noun)
the time of day immediately following sunset	the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)
	the day before
	the period immediately before something